# [Cartesia](<https://cartesia.ai/>)

Real-time text-to-speech API with natural AI voices, laughter, and emotion in 40+ languages — built for AI agents and interactive apps.

Freemium·AI·AI Generation

Freemium·AI·AI Generation

![Cartesia preview 1](<https://framerusercontent.com/assets/nvFWoimT13QFzTrSNSycJkZp5o.jpg>)

## What is Cartesia?

Cartesia provides Sonic-3, a real-time streaming text-to-speech API that generates natural, expressive voices with AI-powered laughter and emotion. Supporting 40+ languages, it's designed for AI agents, interactive apps, and any application that needs lifelike voice synthesis with low latency.

## Features

- Streaming TTS API (Sonic-3)

- AI laughter and emotion

- 40+ languages

- Built for AI agents and interactive apps

## FAQs

Common questions about Cartesia

What is Cartesia Sonic-3?

Sonic-3 is Cartesia's streaming text-to-speech API that generates natural voices with laughter and emotion in 40+ languages.

Is Cartesia free?

Cartesia offers a freemium model — check their site for current pricing and free tier limits.

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